Tonight's the night you can see Toby Keith, Bret Michaels, Dropkick Murphys, Lupe Fiasco and the Doobie Brothers headline the Summerfest stages at the Harley-Davidson 110th Anniversary Celebration.

The weekend celebration boasts over 66-band performances and will start early for H.O.G. (Harley Owners Group) members today, who can arrive at Maier Festival Park as early as noon with appropriate H.O.G. identification.

If Harley isn't your scene, dress up and join the Steam Punk Ball and Marketplace at Hot Water Wherehouse tonight at 9. The event will bring 19th-century historical science fiction to life in circus stunts, marketplace vendors, costume pieces, burlesque and gypsies.